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Coleoptera, Ptinidae, Dorcatominae) Vestnik zoologii, 49(1): 13–34, 2015 DOI 10.1515/vzoo-2015-0002 UDC 595.766.4(47) KEY TO PALAEARCTIC SPECIES OF THE GENUS STAGETUS (COLEOPTERA, PTINIDAE, DORCATOMINAE) I. N. Toskina Post box 25, Moscow, 107241 Russia E-mail: [email protected] Key to Palaearctic Species of the Genus Stagetus (Coleoptera, Ptinidae, Dorcatominae). Toskina, I. N. — Th e key to 37 Palaearctic species and 6 subspecies of the genus Stagetus Wollaston, 1861 is composed. New morphological characters for species diff erences were used. Key words: Stagetus, Dorcatominae, Ptinidae, Coleoptera, Palaearctic, key. Таблица для определеления палеарктических видов рода Stagetus (Coleoptera, Ptinidae, Dor- catominae). Тоскина И. Н. — Составлена таблица для определения 37 палеарктических видов и 6 подвидов рода Stagetus Wollaston, 1861. Использованы новые признаки внешней морфологии для различения видов. Ключевые слова: Stagetus, Dorcatominae, Ptinidae, Coleoptera, Палеарктика, таблица для опре- деления видов. Introduction Th e genus Stagetus Wollaston, 1861 is rather rich in species. However, the last complete key to Palaearctic species of Stagetus was composed by Reitter more than 100 years ago (Reitter, 1901). Many new species were described from that time, but keys were composed only for limited regions: Canary Islands (Israelson, 1974), Pyrenean Peninsula (Español, 1992), USSR — for 4 species only (Logvinovskij, 1985). We propose a new key to Palaearctic species of this genus, which includes recently described species, and supplementary data for typi- cal material available to us, and some data not included in the keys from named articles by Reitter (1884, 1889), Schilsky (1899), Obenberger (1917), Español (1969 a, b), Israelson (1971 a, b), Zahradník (1997) and some others. Material and methods New characters were used when composing the key: shape of punctures in punctation of pronotal surface and in elytral striae, distance between eyes, ratio between segments of antennae, and their shape, ratio between width of stria and interstria (this character was introduced by Israelson, 1971 b), and some others. Characters of ventral surface were not used partly because of contamination with glee and partly because of the almost complete absence of these characters in descriptions of already known species. Th e width of antennal segments was measured along apical margin of segment. Length of the pronotum was measured in profi le in a position with the apical and basal margins aligned at the same level. Measurements of pronotum from above gave higher errors. Th e elytral length was measured from the basal margin of scutel- lum along elytral suture. Th e elytral width was measured somewhat backwards of the shoulders. We have used the typical materials from Hungary Museum of Natural History (HMNH): Th eca dorcato- moides Reitter, 1884; Th eca puncticollis Reitter, 1884; Th eca reitteri Schilsky 1899; Th eca remota Reitter, 1884; Th eca sardoa Reitter, 1915; Th eca xyletina Reitter, 1889, and also non-typical specimens Stagetus pilula (Aubé, 1861) from Zoological Institute of the RAS, St. Petersburg (ZISP) and S. numidicus (Pic, 1903) from HMNH. It is considered that Th . reitteri is a junior synonym of S. latior (Pic, 1899), Th . numidica is a junior synonym of S. championi (Schilsky, 1899), Th . remota is a junior synonym of S. andalusiacus cribricollis (Aubé, 1861) (Español, 1969 a). Key to Palaearctic species of the genus Stagetus 1. Shoulder-knobs absent (subgenus Anomotheca). .......................................................................................... 2 — Shoulder-knobs developed. ............................................................................................................................. 20 2. Pronotal posterior angles fl attened, sometimes posterior angles curved up or sometimes lateral margins fl attened. .............................................................................................................................................................. 3 14 I. N. Toskina — Lateral margins or posterior angles not fl attened and posterior angles not curved up in pronotum. ... 9 3. Pronotal lateral margins fl attened. Pronotum 1.4 times as wide as long, punctation dual on disc and sides. An- tennae: 8th segment 1.5 times as wide and long as the 7th one; the latter larger than the 6th segment. 11th seg- ment fusiform, 3.5 times as long as wide and 2.4 times as long as the 10th segment. Scutellum semioval, without large point at either side. Elytra 1.23 times as long as wide, with hardly visible shoulder knobs. Striae slit-like on elytral disc. Beetle black, elytra tinged with brownish, legs dark brown. Pubescence light grey, heterogeneous, suberect. Body oval, convex. Length 2.25 mm, width 1.25 mm. Algeria. ....................... S. clarki Toskina, 2012 — Only pronotal posterior angles fl attened or curved up. [Other characters variable] ................................ 4 4. Elytra connate, 1.12 times as long as wide. Pronotal posterior angles fl attened very shortly. Antennae: 8th segment about as wide as the 7th one and not wider than preceding segments. 11th segment 5 times as long as wide and 1.66 times as long as the 10th segment. Pronotum 1.46 times as wide as long, strongly conically narrowing to apex; punctation dual on disc, uniform on sides, where punctures are rather large. Scutellum triangular, without large point at either side. Interstriae fl at, striae slit-like on elytral disc and sides. Aedeagus: penis narrowing near apex; parameral appendages long, hamate (fi g. 1). Beetle black, shining, tibiae and tarsi dark brown. Pubescence grayish-yellowish, dual, short, erect. Body strongly convex. Length 2.7 mm, width 1.5 mm. Canary archipelago: Gomera Isl. .....................................................................S. israelsoni Toskina, 2012 — Elytra not connate. [Other characters variable]. ............................................................................................ 5 5. Scutellum triangular, with short line at either side. Pronotum short: 1.5–1.6 times as wide as long; punctation dual on disc, large punctures round; lateral parts with rows of large punctures. Elytra 1.2 times as long as wide; interstriae fl at on disc; convex on sides. Striae formed with oval punctures on disc and with large rectangular or quadrate ones on sides, so lateral interstriae are as wide as lateral striae. Aedeagus: penis parallel-sided, 4 times as long as wide at its apex. Parameres short, their appendages are long, look like curved baculiform sticks (fi g. 2). Beetles black dark-red, antennae greyish yellow. Pubescence light grey, dual, suberect. Length 1.6–1.7 mm, width 0.95 mm. S. Italy (Calabria). ..............................................................S. calabriensis Toskina, 2012 — Scutellum without large point or line at either side. [Other characters variable]. .................................... 6 6. Lateral striae widened owing to wide punctures in basal third of elytra. Body narrowly oval. Pronotal surface with dual punctation; posterior angles widely fl attened, not curved up. Elytra 1.32 times as long as wide. Interstriae convex on sides. Aedeagus: penis narrowing to apex and 6 times as long as wide at its apex. Parameres long, their appendages long, nearly baculiform (fi g. 3). Beetle reddish brown, anten- nae pale yellow. Pubescence dual: short hairs appressed, long ones erect. Length 2.1 mm, width 1.1mm. Canary archipelago: Hierro Isl. ........................................................................ S. euphorbiae Israelson, 1971 — Lateral striae narrow in basal third of elytra. Beetles nearly round. Aedeagus: penis does not narrow towards apex. [Other characters variable.] West Mediterranean. ................................................................7 7. Pronotal posterior angles fl attened and curved up. Interstriae slightly convex on elytral disc. Aedeagus: penis straight, about 4 times as long as wide at its apex; parameres comparatively long, their appendages 2 3 1 4 5 Fig. 1–5. Aedeagi: 1 — Stagetus israelsoni (aft er Toskina, 2012: fi g. 47); 2 — S. calabriensis (aft er Toskina, 2012: fi g. 9); 3 — S. euphorbiae (aft er Israelson, 1971 a: fi g. 4); 4 — S. andalusiacus andalusiacus (aft er Español, 1969 a: fi g. 4); 5 — S. andalusiacus cribricollis (aft er Español, 1969 a: fi g. 5). Scale bars 0.05 mm. Рис. 1–5. Эдеагусы: 1 — Stagetus israelsoni (по: Toskina, 2012: рис. 47); 2 — S. calabriensis (по: Toskina, 2012: рис. 9); 3 — S. euphorbiae (по: Israelson, 1971 a: рис. 4); 4 — S. andalusiacus andalusiacus(по: Español, 1969 a: рис. 4); 5 — S. andalusiacus cribricollis (по: Español, 1969 a: рис. 5). Масштабные линейки 0,05 мм. Key to Palaearctic Species of the Genus Stagetus (Coleoptera, Ptinidae, Dorcatominae) 15 nearly papilliform, 4 times as long as wide (fi g. 4). Beetles black, tinged with brownish. Length 1.0– 1.5 mm. West Mediterranean. ...................................................S. andalusiacus andalusiacus (Aubé, 1861) — Pronotal posterior angles only fl attened, not curved up. Interstriae fl at on elytral disc. Beetle dark (dark chestnut, dark brown) or rufousish. [Other characters variable] .................................................................8 8. Punctation very dense on pronotum, large punctures separated by less than 1 puncture diameter. Shoulder angles fl attened, with oblique impressing (Schilsky, 1899). Long hairs arranged in rows on elytral disc. Ae- deagus: penis slightly widened near apex, 3.7 times as long as wide at its
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